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Interureteric ridge edema: incidence and etiology
M Y Chen1, R J Zagoria, R B Dyer
1Department of Radiology, Bowmann Gray School of Medicine, Wake Forest University, Winston-Salem, NC 27157-1088, USA.
Abdominal Imaging
|July 1, 1995
Summary
Interureteric ridge edema on intravenous urography (IVU) is a key sign of acute distal ureteral obstruction, primarily caused by kidney stones. This finding was observed in 4% of patients, highlighting its diagnostic value.
Area of Science:
- Radiology
- Urology
- Medical Imaging Diagnostics
Background:
- Interureteric ridge edema is an imaging finding observed during intravenous urography (IVU).
- It is associated with conditions such as acute lower ureteral obstruction, trauma, or calculi.
- The precise relationship between interureteric ridge edema and ureteral calculi requires further investigation.
Purpose of the Study:
- To investigate the association between interureteric ridge edema and acute distal ureteral obstruction.
- To determine the specific role of ureteral calculi as a cause of interureteric ridge edema.
Main Methods:
- Retrospective review of 338 patients undergoing IVU over a 6-month period.
- Assessment for the presence of interureteric ridge edema in all reviewed patients.
- Correlation of edema findings with clinical indications and diagnoses.
Main Results:
- Interureteric ridge edema was identified in 12 patients (4% of 338).
- All patients with interureteric ridge edema presented with acute lower ureteral obstruction due to stones.
- Partially filled bladder or post-void bladder films optimally demonstrated the edema.
Conclusions:
- Interureteric ridge edema is predominantly indicative of distal ureteral obstruction caused by stones.
- It may also be observed following recent stone passage or in other etiological contexts.
- The edema was present in 26% of patients diagnosed with acute lower ureteral obstruction.